---
title: "The source of \"false\" alarms: Forced entrance, Prealarm - Roger"
description: "Roger - lider branży zabezpieczeń oferujący systemy kontroli dostępu, rejestracji czasu pracy, rejestracji pracy wartowników. Zapraszamy!"
url: "https://www.roger.pl/en/support/technical-support/faq-frequently-asked-questions/faq-access-control/racs-4-system/access-controllers/the-source-of-false-alarms-forced-entrance-prealarm"
date: "2026-06-27T13:41:20+00:00"
language: "en-GB"
---

#  The source of "false" alarms: Forced entrance, Prealarm

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**Description:**
**What is the source of "false" alarms: Forced entrance, Prealarm?**

**Solution:**

One of the causes of the alarms may be incorrect option settings for input line if controller does not have door sensor connected and input line remains unprogrammed (programmed to default value: door sensor). This may cause false alarms.

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